New patch to review for coreboot: amd/mct/ddr3: Wait for northbridge P-state transitions

[Timothy Pearson]

Timothy Pearson ([e-mail]) just uploaded a new patch set to gerrit, which you can find at https://review.coreboot.org/18069

-gerrit

commit 3075d79fb2f9f153651ec336040f1e6ccac5c5bd
Author: Timothy Pearson 
Date:   Mon Jan 9 12:33:22 2017 -0600

amd/mct/ddr3: Wait for northbridge P-state transitions

The existing code waiting for northbridge P-state transitions
    contained a logical error preventing correct operation.  Fix
    the logical error and force coreboot to wait for the P-state
    transitions per the BKDG.

Found-by: Coverity Scan #1347388

Change-Id: I35f498c836db1439734abe684354c18c8e160368
    Signed-off-by: Timothy Pearson 
---
 src/northbridge/amd/amdmct/mct_ddr3/mct_d.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/northbridge/amd/amdmct/mct_ddr3/mct_d.c b/src/northbridge/amd/amdmct/mct_ddr3/mct_d.c
index d1d6e8f..958b382 100644
--- a/src/northbridge/amd/amdmct/mct_ddr3/mct_d.c
+++ b/src/northbridge/amd/amdmct/mct_ddr3/mct_d.c
@@ -6737,7 +6737,7 @@ void mct_ForceNBPState0_En_Fam15(struct MCTStatStruc *pMCTstat,
    		/* Wait until CurNbPState == NbPstateLo */
    		do {
    			dword2 = Get_NB32(pDCTstat->dev_nbctl, 0x174);
-			} while (((dword2 << 19) & 0x7) != (dword & 0x3));
+			} while (((dword2 >> 19) & 0x7) != (dword & 0x3));
    	}
    	dword = Get_NB32(pDCTstat->dev_nbctl, 0x170);
    	dword &= ~(0x3 << 6);		/* NbPstateHi = 0 */
@@ -6748,7 +6748,7 @@ void mct_ForceNBPState0_En_Fam15(struct MCTStatStruc *pMCTstat,
    		/* Wait until CurNbPState == 0 */
    		do {
    			dword2 = Get_NB32(pDCTstat->dev_nbctl, 0x174);
-			} while (((dword2 << 19) & 0x7) != 0);
+			} while (((dword2 >> 19) & 0x7) != 0);
    	}
    }
 }